Wind power main shaft casting mold
By setting up risers and curved cold iron in the wind power spindle casting mold, the problems of shrinkage and collapse defects in the wind power spindle horn are solved, and the quality and product rate of the castings are improved.
Patent Information
- Application Number
- CN202323596655.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-27
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2033-12-27
AI Technical Summary
During the casting process of wind power spindle, rough holes and shrinkage on the surface or inside due to the thin wall structure of the horn part, which affects the casting quality and cannot meet the design requirements.
Design a wind power spindle casting mold, including gate cup and sand shell assembly, set up the riser and curved cold iron of the annular array, support the horn part through the riser and cold iron combination, avoid shrinkage and collapse defects, and improve castings quality.
By setting up a riser at the maximum bent part of the wind power spindle and using curved cold iron, stable support and retraction of the horn part can be achieved, and shrinkage and collapse defects can be avoided, and the quality and product rate of the castings are improved.
Smart Images
Figure CN222175856U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of casting of wind turbine main shafts, in particular to a casting mould for a wind turbine main shaft. Background Art
[0002] Wind turbines are a type of generator widely used in China, mainly composed of blades, hubs, main shafts, gearboxes, frames, etc. In wind turbine generator sets, the main shaft bears various loads transmitted from the impeller, transmits torque to the speed-increasing gearbox, and transmits axial thrust and aerodynamic bending moment to the nacelle and tower. Wind turbine main shafts include solid wind turbine main shafts and hollow wind turbine main shafts. There is currently a hollow wind turbine main shaft in the shape of a trumpet, which is formed by casting. During the casting process, since the trumpet part of the main shaft is a thin-walled structure, there are rough holes on the surface or inside of the casting at the trumpet part of the wind turbine main shaft. In severe cases, many scattered small shrinkage cavities form shrinkage. Due to the coarse grains of the casting at the shrinkage cavities or shrinkage cavities, the casting quality cannot meet the design requirements. Therefore, it is necessary to control the shrinkage cavities or shrinkage cavities at the trumpet part during casting. Utility Model Content
[0003] The utility model aims to solve the above technical problems and provide a wind turbine main shaft casting mold, which controls the generation of shrinkage cavities or shrinkage porosity in the horn part through the casting mold, thereby improving the casting quality of the wind turbine main shaft.
[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a wind turbine main shaft casting mold, including a pouring cup and a sand shell assembly, the lower end of the pouring cup is connected to the upper end of the sand shell assembly, the sand shell assembly includes an upper film sand shell and a plurality of lower film sand shells, a mold cavity is arranged between the upper film sand shell and the lower film sand shell and between the lower film sand shells, a sand core assembly is arranged in the mold cavity, and the sand core assembly includes a lower sand core and a plurality of upper sand cores;
[0005] The sand shell assembly is provided with a pouring cup, the sand core assembly is provided with a casting assembly, and the pouring cup is connected with the casting assembly;
[0006] The casting assembly includes a straight runner, a plurality of cross runners and a plurality of ingates, a straight runner is formed between the plurality of upper sand cores and the lower sand cores by opening a circular hole, the pouring cup is connected to the straight runner, a cross runner connected to the straight runner is arranged on the lower end surface of the lower sand core, and an ingate for connecting the cross runner and the mold cavity is also arranged on the lower end surface of the lower sand core;
[0007] A group of risers arranged in an annular array are arranged in the lower sand core, and the risers are arranged directly facing the maximum bending part of the wind turbine main shaft.
[0008] In order to prevent collapse defects or mold collapse at the horn position of the wind turbine main shaft, a further preferred technical solution is that a group of chillers is provided in the lower sand core.
[0009] In order to form a stable support for the horn part and at the same time cooperate with the riser to compensate for shrinkage through the riser to avoid collapse defects, a further preferred technical solution is that the chiller is a curved long strip chiller.
[0010] In order to form a stable support for the trumpet part and at the same time avoid collapse defects by cooperating with the riser and compensating the shrinkage through the riser, a further preferred technical solution is that a group of the cold irons are arranged in an annular shape on the lower sand core between two adjacent risers.
[0011] In order to form a stable support for the trumpet part and at the same time cooperate with the riser to compensate for shrinkage through the riser to avoid collapse defects, a further preferred technical solution is that the lower sand core is provided with a cold iron groove arranged according to a long strip of cold iron, the cold iron is placed in the cold iron groove, and the outer side surface of the cold iron is flush with the outer peripheral surface of the lower sand core.
[0012] Compared with the prior art, the utility model has the following beneficial effects: by arranging four risers in a ring at the maximum bending part of the wind turbine main shaft, each riser can compensate for the shrinkage of one quarter of the horn part of the wind turbine main shaft, thereby avoiding shrinkage at the horn part of the wind turbine main shaft;
[0013] Curved chillers are arranged along the maximum bending part of the wind turbine main shaft to extend to both ends to form a stable support for the trumpet part. At the same time, they cooperate with the riser to compensate for shrinkage through the riser to avoid collapse defects, thereby improving the quality and product rate of the casting. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is one of the axonometric drawings of the utility model;
[0015] Figure 2 This is the second axonometric drawing of the utility model;
[0016] Figure 3 This is the third axonometric drawing of the utility model;
[0017] Figure 4 This is the axonometric drawing of the wind turbine main shaft of the utility model;
[0018] In the figure: 10. pouring cup; 20. sand shell assembly; 21. upper film sand shell; 22. lower film sand shell; 30. casting assembly; 31. sprue; 32. horizontal runner; 40. sand core assembly; 41. upper sand core; 42. lower sand core; 43. chiller; 44. riser; 50. wind turbine main shaft. DETAILED DESCRIPTION
[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0020] Example
[0021] like Figure 4 As shown, there is a hollow wind turbine main shaft in a trumpet shape. The wind turbine main shaft 50 is formed by casting. During the casting process, since the trumpet part of the wind turbine main shaft 50 is a thin-walled structure, there are holes with rough surfaces on the surface or inside of the casting at the trumpet part of the wind turbine main shaft 50. In severe cases, many scattered small shrinkage cavities form shrinkage. Since the grains of the casting at the shrinkage cavities or shrinkage cavities are coarse, the casting quality cannot meet the design requirements. Therefore, it is necessary to control the generation of shrinkage cavities or shrinkage cavities at the trumpet part during casting.
[0022] like Figure 1 As shown, a wind turbine main shaft casting mold includes a pouring cup 10 and a sand shell assembly 20, wherein the lower end of the pouring cup 10 is connected to the upper end of the sand shell assembly 20, and the sand shell assembly 20 includes an upper film-coated sand shell 21 and a plurality of lower film-coated sand shells 22, and a mold cavity is provided between the upper film-coated sand shell 21 and the lower film-coated sand shell 21 and between the lower film-coated sand shells 22, and the mold cavity matches the outer contour of the wind turbine main shaft 50, in order to form a trumpet-shaped inner cavity of the wind turbine main shaft 50, A sand core assembly 40 is provided in the mold cavity. The sand core assembly 40 includes a plurality of upper sand cores 41 and lower sand cores 42. The lower sand core 42 is trumpet-shaped. The outer contour formed by the combination of the upper sand core 41 and the lower sand core 42 matches the trumpet-shaped inner cavity of the wind turbine main shaft 50. The sand core assembly 40 and the mold cavity form a contour cavity of the wind turbine main shaft 50. By injecting metal liquid between the mold cavity and the sand core assembly 40, the metal liquid is cooled to form a wind turbine main shaft 50 casting.
[0023] The sand shell assembly 20 is provided with a pouring cup 10, the sand core assembly 40 is provided with a casting assembly 30, and the pouring cup 10 is connected to the casting assembly 30;
[0024] The casting assembly 30 includes a sprue 31, a plurality of runners 32 and a plurality of ingates. The sprue 31 is formed by opening a circular hole between the plurality of upper sand cores 41 and the lower sand cores 42. The pouring cup 10 is connected to the sprue 31. The upper end surface of the lower sand core 42 is provided with a runner 32 connected to the sprue 31. The upper end surface of the lower sand core 42 is also provided with an ingate for connecting the runner 32 and the mold cavity.
[0025] like Figure 2 and 3As shown, in order to avoid shrinkage at the horn position of the wind turbine main shaft 50 and improve the quality of the wind turbine main shaft 50 casting, a group of risers 44 arranged in an annular array are provided in the lower sand core 42, and the risers 44 are arranged opposite to the maximum bending position of the wind turbine main shaft 50. The wind turbine main shaft 50 is deformed the most at this position, so it is most likely to shrink at this position. Therefore, the risers 44 are arranged at this position. When the wind turbine main shaft 50 is cooled, this position will cool and shrink, and the risers 44 can achieve the effect of sufficient shrinkage compensation for this position. In this embodiment, 4 evenly arranged risers 44 are preferred. Since the size of the wind turbine main shaft 50 is large, if the number of risers 44 cannot be reasonably set, the effect of sufficient shrinkage compensation cannot be achieved. Therefore, by arranging 4 risers 44 in an annular manner, each riser 44 can compensate for the shrinkage of one-quarter of the horn portion of the wind turbine main shaft 50, so as to avoid shrinkage at the horn position of the wind turbine main shaft 50.
[0026] Moreover, since the wind turbine main shaft 50 is relatively large in size and thin-walled, it is easy to produce mold collapse defects or mold collapse at the horn position of the wind turbine main shaft 50. Therefore, a group of cold irons 43 are also provided in the lower sand core 42. The cold irons 43 are curved long strip cold irons 43. A group of cold irons 3 are arranged in an annular manner on the lower sand core 42 between two adjacent risers 44. The lower sand core 42 is provided with a cold iron groove arranged according to the long strip cold iron 43. The cold iron 43 is placed in the cold iron groove. The outer side surface of the cold iron 43 is aligned with the lower sand core 42. The outer peripheral surface of 42 is flush, and the cold iron 43 can form a support for the trumpet part of the wind turbine main shaft 50, and can also accelerate the cooling of the trumpet part of the wind turbine main shaft 50 to avoid collapse defects or mold collapse; in this embodiment, 4 uniformly arranged cold irons 43 are preferably used, each cold iron 43 is bent along the shape of the trumpet, and extends to both ends along the maximum bending part of the wind turbine main shaft 50 to form a stable support for the trumpet part, and at the same time, by cooperating with the riser 43, the riser 43 is used to compensate for shrinkage, thereby avoiding collapse defects and improving the quality and product rate of the casting.
[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A wind turbine main shaft casting mold, comprising a pouring cup and a sand shell assembly, wherein the lower end of the pouring cup is connected to the upper end of the sand shell assembly, the sand shell assembly comprises an upper film-coated sand shell and a plurality of lower film-coated sand shells, and a mold cavity is arranged between the upper film-coated sand shell and the lower film-coated sand shell and between the lower film-coated sand shells, characterized in that: A sand core assembly is provided in the mold cavity, and the sand core assembly includes a lower sand core and a plurality of upper sand cores; The sand shell assembly is provided with a pouring cup, the sand core assembly is provided with a casting assembly, and the pouring cup is connected with the casting assembly; The casting assembly includes a straight runner, a plurality of cross runners and a plurality of ingates, a straight runner is formed between the plurality of upper sand cores and the lower sand cores by opening a circular hole, the pouring cup is connected to the straight runner, a cross runner connected to the straight runner is arranged on the lower end surface of the lower sand core, and an ingate for connecting the cross runner and the mold cavity is also arranged on the lower end surface of the lower sand core; A group of risers arranged in an annular array are arranged in the lower sand core, and the risers are arranged directly facing the maximum bending part of the wind turbine main shaft.
2. A wind turbine main shaft casting mold according to claim 1, characterized in that: A group of chillers is also arranged in the lower sand core.
3. A wind turbine main shaft casting mold according to claim 2, characterized in that: The cold iron is a curved long strip cold iron.
4. A wind turbine main shaft casting mold according to claim 3, characterized in that: A group of chillers are arranged in an annular shape on the lower sand core between two adjacent risers.
5. A wind turbine main shaft casting mold according to claim 4, characterized in that: The lower sand core is provided with a cold iron groove arranged according to the long strip cold iron, the cold iron is placed in the cold iron groove, and the outer side surface of the cold iron is flush with the outer peripheral surface of the lower sand core.